<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge,chrome=1">
    <meta name="author" content="金西振">
    <title></title>
    <style>
    *{
        box-sizing: border-box;
    }
    ul{
        padding: 0;
        margin: 0;
        list-style: none;
    }
    .box{
        width: 520px;
        height: 280px;
        margin: 100px auto;
        position: relative;
    }
    .img-list li{
        position: absolute;
        top: 0;
        left: 0;
        display: none;
    }
    .img-list li.current{
        display: block;
    }
    .indicator{
        width: 100%;
        position: absolute;
        left: 0;
        bottom: 20px;
        display: flex;
        justify-content: center;
        color: white;
    }
    .indicator li{
        width: 20px;
        height: 20px;
        background-color: #aaa;
        text-align: center;
        line-height: 20px;
        margin: 0 5px;
        border-radius: 50%;
        cursor: pointer;
    }
    .indicator li.active{
        background-color: red;
    }
    .img-click span{
        width: 30px;
        height: 40px;
        line-height: 40px;
        text-align: center;
        color: white;
        background-color: rgba(0, 0, 0, 0.1);
        position: absolute;
        top: calc(50% - 20px);
        display: none;
    }
    .img-click span:hover{
        background-color: orange;
        cursor: pointer;
        
    }
    .img-click .prev{
        left: 0;
    }
    .img-click .next{
        right: 0;
    }
    </style>
</head>
<body>
    <!-- <a href="javascript:;" onclick="alert(123);">123</a> -->
    <div class="box">
        <ul class="img-list">
            <li class="current"><a href="#"><img src="img/01.jpg" alt=""></a></li>
            <li><a href="#"><img src="img/02.jpg" alt=""></a></li>
            <li><a href="#"><img src="img/03.jpg" alt=""></a></li>
            <li><a href="#"><img src="img/04.jpg" alt=""></a></li>
            <li><a href="#"><img src="img/05.jpg" alt=""></a></li>
        </ul>
        <ul class="indicator">
            <li class="active">1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
        </ul>
        <div class="img-click">
            <span class="prev">&lt;</span>
            <span class="next">&gt;</span>
        </div>

    </div>
 <script src="jquery.js">   </script>
</body>
</html>
<script>
   var index = 0;
   var timer  = setInterval(nextImg,1000);
   function nextImg(){
       //    方法一
    //    index = index==4 ? 0 : index+1;
    //    index等于5时变成0，否则index+1
    // 方法二
    index++;
    if (index==5) {
        index=0;
    }
    showImg();
   }
   function showImg(){
       $('.img-list li').eq(index).stop().fadeIn(1000).siblings
       ().fadeOut(1000);
       $('.indicator li').eq(index).addClass('active')
       .siblings().removeClass('active');
   }
   
//  2.根据指示灯切换
// mouseenter:鼠标进来 不支持冒泡
  $('.box').mouseenter(function(){
    clearInterval(timer);
    $('.img-click span').stop().fadeIn(2000);
    console.log('停止');
  }).mouseleave(function(){
      timer = setInterval(nextImg,1000);
      $('.img-click span').stop().fadeOut(2000);
  });
//   根据指示灯进行切换
  $('.indicator li').hover(function(){
      index = $(this).index();
      showImg();
  });
//   3.点击切换
$('.next').click(function(){
    nextImg();
});
$('.prev').click(function(){
    index --;
    if (index == -1) {
        index = 4;
    }
    showImg();
})


</script>